OP1.fun and OP-z

I’m trying to get a utility where I can manage drum and synths.
I thought the OP1.fun would do it, but it doesn’t recognise the OP-Z when I put it in disk mode.
I’m using a macbook. OS 10.15.3

Is there a recommended app?
The OP-1 utility from the manual doesn’t work on my OS. It seems to be from 2011??

This seems obvious to me, but I must be missing something very basic. Like a brain